Perhaps you should try some spelling variations:
"world economic and financial assets." » "world economic and financial markets.", "world economic and financial crises.", "world economy and financial assets."
"world economic and financial service." » "world economy and financial service."
"world economic and financial services." » "world economy and financial services.", "world economic and financial series."
"world economic and financial studies." » "world economy and financial studies."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("world economic and financial service.") or ("world economic and financial services."))) or ("world economic and financial assets."))) or ("world economic and financial studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("world economic and financial service.") OR ("world economic and financial services."))) OR ("world economic and financial assets."))) OR ("world economic and financial studies.")).
• Removing quotes may allow a broader search: (((((( world economic and financial service. ) or ( world economic and financial services. ))) or ( world economic and financial assets. ))) or ( world economic and financial studies. )).
• Adding a wildcard symbol may retrieve word variants: (((((("world economic and financial service.") or ("world economic and financial services."))) or ("world economic and financial assets."))) or ("world economic and financial studies."))*.